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GU Piscium b
GU Piscium b (GU Psc b)〔 is a directly imaged planetary-mass companion orbiting the star GU Piscium, with an extremely large orbit of , and an apparent angular separation of 42 arc seconds.〔(【引用サイトリンク】title=Planet GU Psc b )〕 The planet is located at right ascension declination at a distance of .〔
==Properties==
An orbital revolution around its parent star (which is 1/3 the mass of the Sun) or "year", would take approximately 163,000 years〔 to complete, considering a circular orbit with 2000 AU as the semi-major axis. It is a gas giant〔(【引用サイトリンク】title=Odd planet, so far from its star )〕 located in the constellation of Pisces, 155 light-years from the Solar System, and estimated to have a mass nine to thirteen times that of Jupiter,〔(【引用サイトリンク】title=GU Psc b: Newly Discovered Exoplanet Takes 80,000 Years to Orbit its Star )〕 and a surface temperature of 1000 K.
It is a relatively young stellar system part of the AB Doradus moving group, ca. 30 main stars created from the same molecular cloud less than 100 million years ago, and the only one found among the 90 stars of the group examined.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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